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M. L. RITCHIE. Tube Drawing Device.

No, 23 ,8 Patented Aug. 31,1880.

WITNESSES NVEN 0R ATTORNEYS QQMwQ E UNITED STATES PATENT OFFICE.

MATTHEW L. RITCHIE, OF NEW YORK, N. Y.

TUBE-DRAWING DEVICE.

SPECIFICATION forming part of Letters Patent No. 231,852, dated August 31, 1880. Application filed March 16, 1880. (ModeL) of a side elevation, partly broken away. Fig.

2 is a detail of the die of my device for making tubing, and Fig. 3 is an end View of the same.

This invention has relation to devices for making tubing and reducing and remaking old tubing; and it consists in the improvements hereinafter fully described, and particularly pointed out in the claim.

The objects of the invention are to finish the interior of the tube while it is being drawn out so as to free the tube from folds, wrinkles, or puckers, and also to regulate the thickness of the tubing.

In the accompanying drawings, A designates a die, through which the tube 13 is represented as being drawn. This tube is also illustrated to show the reduced portion thereof. The die A has inclined walls a a, the inclination being such as to increase the area of the die at one end.-

O designates a mandrel, having tapering sides 0, which correspond with the walls of 3 5 the die A. This mandrel is secured upon a rod, D, so that by means of a screw and wheel at one end of the rod it may be forced for ward into a tube which it is required to draw through the die. As the tube is now drawn and reduced the mandrel, by filling the interior of the tube, prevents wrinkling and the like, and by adjusting the mandrel relatively to the die the walls of the tube will be increased or diminished in thickness according to the position of said mandrel within the die.

What I claim, and desire to secure by Letters Patent, is-

In a device for making tubing and reducing and remaking old tubing, the die A, having inclined walls a a, which give the die increased area at one end, in combination with a mandrel, O, tapered, as at c, to correspond to the walls of the die A, so that by proper adjustment of the mandrel within the die the walls of the tube may be varied in thickness at pleasure, as set forth.

In testimony that I claim the above I have hereunto subscribed my name in the presence of two witnesses.

MATTHEW L. RITCHIE.

Witnesses SAML. CAMPBELL, HOWARD CAMPBELL. 

